Mixing apparatus for dry materials.



No. 814,233. PATENTED MAR. 6, 1906. G. RAPS.

MIXING APPARATUS FOR DRY MATERIALS.

APPLICATION FILED AUG19,1905.

UNITED STATES '(EEORG RAlS,

PATENT OFFICE.

OF STU L B ERG, H ER M AN Y.

Specification of Letters Patent.

Patented Maren fh 1906.

Application filed Augiiat 19 1905 Serial No. 274,893.

To all whom it may concern.-

I Beit known that I, Gnonc liars, a subject of the King of Prussia, German Emperor, residingat Stolbcrg, Rheinland, Germany, have invented certain new and useful improyements in Mixin A crates for Dry hinterials, of which t e (Blowing is a full, clear, and exact description.

This invention relates ing i'filXll'ig- 118,CllineS 4di8i is to say to mixing-machines in which by turningthe drum in one direction the'niixing of the materisi is brought about and in which after the feed of the material to be mixed'is completed the disohar e'of the same is accomplished by turning drum in the other direction. The mixing up eratus of this kind hitherto known was not a opted for working on a large scale, because for each mixing it could only be fed 20 with a com aratively small quantity "of the material.

ow according to this invention this defect 1S removed bythc mix ng-drum,

, which is formed tapering in the ordinary way,

entirely closed at its larger end, and provided internally with spiral mixing-blades, while being rotatable on a horizontal or an approxilnately horizontal axis, 1111351011 and dischar e a ertures being situated 111 the same en wal of the drum. In

0 consequence of this drum construction the material to be mixed is constantly forced to the rear on "the rotation of the drum in one direction, Where it accumulates at the rear wall of the drum to almost the entire height 40 versed, the spiral of the same and in a very short time becomes thoroughly mixed under the action of the forwarding blades or scoops, which continuously circulate it from beneath'upward. If the'die rection. of the rotation of the drum be remixing-blades cause a re turn of the material toward the feed-a erturc and a gradual discharge therefrom. his ar rangement and structural formation of the -mixin hamber permits eonsiderablymore material to' be introduced into the drum during'. a mixing period than was hitherto possible with drums of similar size.

A mixing-machine in accordance with this invention is shown in the accompanying 5o drawings,

in which- Figure 1 is a longitudinai section, and Fig. 2 an end viewthereof;

The scoops or blades lying'in the part of the drum cuteoii' are shown in dotted lines.

The machine consists of a large conical drum i, rotatably mounted in known manner to continuous-work;

and also by the ad-' by means of two rings :1V and b on runners or rollers e and d. T he drum is entirely closed at the larger end face, while in the smaller end face opposite it at which the feed and discharge take place a ciosing ring a, o th conical annular projection f, is arranged, through the central aperture oi' which the feed-hopper'for the material to bcmixcd pro jccts into the drum. The ring r, tlu outer diameter of which is somewhat smaller than the drum-aperture, servos principally as a check to the niatcrieiin its discharge and al- .lows it to emerge gradually and uniformly througha slot 1!.

An outwardly-directed angular edge g is mounted on the outer ed e of the drum, which edge g serves for guiding the material discharged into a receiving-hopper 0.

In the interior of" the drum seveml-p ef erably, for instance, four-pe.rtitions or in termediate walls h-are constructed, extending up to the fourth part of the diameter of the drum, whichrest against the drum i and run spirally.

The drum is operated, as usual, by means of rollers c and with a bevel-gear. The direction of rotation may be altered by means of an open and 'a cross belt k or other suitable devices.

The method of working of the n1ixing1nachine is asfollows: When the drum is set in rotation in one direction, the materials to be mixed are introduced into the fced hopper m in suitable proportions, and in consequence of the formation of the drum and the partitions it are pro elledto the closed rear wall of thedrum. ere the material is piled and constantly tumbled over and over. As the material slips down on each of the partitions toward the entrance it falls into the next compartment, in whichit is e ain conveyed to the rear of the drum. B this movement of theimaterial a thorough y uniform mixture is obtained in a short/time. In order to discharge the drum, its direction of rotation is altered. By the spiral action of the parti; tions the material is conveyed toward the discharge end. The conical form of the drum sets somewhat, against this movement, so that too, sudden a discharge is prevented. The material gradually comes to the front and falls uniformly thro the slotted aperturenfformed between t e closing-ring and annular. edge g. The closing-ring e, which 0 crates to retard the discharge of the material, is held in position by the radial support v entirely 0 -bars p p. constant mixing action. also in ta (es place during the discharge.

Having thus described my invention, what I claim, and desire to secure by Letters Pat,- ent, is

1. The combination of a horizontally-an ranged tapering drum having its-larger end osed and provided with feed and discharge openings at its smaller end, of rotatable means arranged Within the drum to feed the material from the feed-opening t0- Ward the closed end to mix the material and" from the closed end toward the dischar' e;

2. The combination of a horizonta -ar-" ranged tapering drum rotating on an approxi matel horizontal axis, havingits larger e'fifii" entire y closed, and provided with feedand discharge openings at its smaller end; of means arrangedwitbintheidrum to feedlthe material from! the feed opening toward the closedend the material and from the closed end toward the discharge. i 3. The combination of a tapering drum,

rotatable about an axis approximately hori-' zojntal, entirely closed at its larger end and provided means for mixing t emater-ial t 'erein placed, an outv'vardlytumed flange on the other or open end of the drum, a ring fitted in, the

.- open end and spaced fromt the walls of the dru'mto provide inlet and, discharge openings for the drum, means "for sup 'orting the ring and I'neans for rotating the rum.

f Inj witness whereof I hereunto subscribe my name this 5th day of August, A. D. 1905.

G. 'RAPS.

I i l Witnesses:

HENRY QUALFLIEG, F. M. BRUNDAGE.

with an inlet 'an'gla discharge at its smaller en'd, spiral mixingblades arranged 

